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Roman Pasechnik

Senior lecturer

Typical working day..

Mapping the dominant regions of the phase space associated with c c - production relevant for the prompt atmospheric neutrino flux


  • Victor P. Goncalves
  • Rafał Maciuła
  • Roman Pasechnik
  • Antoni Szczurek

Summary, in English

We present a detailed mapping of the dominant kinematical domains contributing to the prompt atmospheric neutrino flux at high neutrino energies by studying their sensitivity to the cuts on several kinematical variables crucial for charm production in cosmic ray scattering in the atmosphere. This includes the maximal center-of-mass energy for proton-proton scattering, the longitudinal momentum fractions of partons in the projectile (cosmic ray) and target (nucleus of the atmosphere), the Feynman xF variable, and the transverse momentum of charm quark/antiquark. We find that the production of neutrinos with energies larger than Eν>107 GeV is particularly sensitive to the c.m. energies larger than the ones at the LHC and to the longitudinal momentum fractions in the projectile 10-8<x<10-5. Clearly, these are regions where we do not control the parton, in particular, gluon, densities. We also analyze the characteristic theoretical uncertainties in the charm production cross section coming from its QCD modeling. The precision data on the prompt atmospheric neutrino flux can efficiently constrain the mechanism of heavy quark production and underlying QCD dynamics in kinematical ranges beyond the reach of the current collider measurements.


  • Theoretical Particle Physics

Publishing year





Physical Review D





Document type

Journal article


American Physical Society


  • Subatomic Physics




  • ISSN: 2470-0010